Underwater, they're working harder than any athlete at the Olympic games.

They launch teammates out of the water and through the air. They suspend themselves upside down and contort their bodies into circus-esque poses without ever touching the bottom of the pool. And, unlike hammer throwers or weightlifters who grimace their way through feats of athleticism, synchronized swimmers perform their grueling routines without showing fatigue.

In other words: Don't be fooled when synchronized swimmers make the sport look easy — it's not.

During synchronized swimming competition in Rio, NBC set up a split-screen camera that showed viewers the action above and below the water at the same time. Here are a few shots from the competitors' routines: